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Fencer Vulns
high 7.5

CVE-2026-93575 json

Io.netty/netty-codec-mqtt: netty: resource exhaustion in mqttdecoder

published 2026-09-18 51 d ago modified 2026-09-25 44 d ago also EUVD-2026-82869

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 33%
public exploits
0
none known

Summary

A flaw was found in Netty's MqttDecoder. An unauthenticated remote attacker can exploit this vulnerability by sending a specially crafted MQTT CONNECT packet. The decoder fails to properly validate the 'Properties Length' against the 'Remaining Length', allowing an attacker to bypass size limits. This leads to excessive memory and CPU consumption, resulting in a denial of service (DoS) due to an OutOfMemoryError.

Patch / fix

  • netty-tcnative SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +8 more 2.0.84-150200.3.51.1
  • netty SLE Module for Package Hub 15 SP7 4.1.138-150200.4.56.1

suse advisories SUSE-SU-2026:4391-1

  • netty openSUSE Tumbleweed 4.1.138-1.1

opensuse advisories openSUSE-SU-2026:11882-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-93575 updated cvss 7.5

io.netty/netty-codec-mqtt: Netty: Resource Exhaustion in MqttDecoder

  • Red Hat AMQ Broker 7 netty-codec-mqtt 4.1.137.Final-redhat-00001 Red Hat build of Apache Camel for Spring Boot 4 netty-codec-mqtt 4.1.137.Final-redhat-00001
    affected: workaround, no fix available “See https://github.com/netty/netty/security/advisories/GHSA-jqf3-r9ww-c5x8 for fixed versions and remediation guidance.”
  • Red Hat JBoss Enterprise Application Platform 7 netty-codec-mqtt 4.1.137.Final-redhat-00001, jboss-eap-7/eap74-els-openjdk8-openshift-rhel8, jboss-eap-7/eap74-els-openjdk11-openshift-rhel8, jboss-eap-7/eap74-els-openjdk17-openshift-rhel8 Red Hat Single Sign-On 7 netty-codec-mqtt 4.1.137.Final-redhat-00001
    affected: workaround, no fix planned “See https://github.com/netty/netty/security/advisories/GHSA-jqf3-r9ww-c5x8 for fixed versions and remediation guidance.”
  • Red Hat Fuse 7 netty-codec-mqtt 4.1.137.Final-redhat-00001
    not affected: vulnerable code not in execute path

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
47 d ago

Exploit prediction

0.39% chance of exploitation in the next 30 days, higher than 33% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Red Hat Red Hat AMQ Broker 7
  • Red Hat Red Hat build of Apache Camel for Spring Boot 4
  • Red Hat Red Hat Fuse 7
  • Red Hat Red Hat JBoss Enterprise Application Platform 7
  • Red Hat Red Hat Single Sign-On 7

Classification

Weakness
  • CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.